Gem Stone Panning What is Gem Stone Panning? Gem Stone Panning is a fun activity for all ages. Your customer will buy a bag of gem or fossil mix, take it out to the sluice and wash away the sand to retrieve different kinds of gems or fossils. The most common stones found in the mix include: quartz crystals, amethyst, orange and green calcite, peacock copper, fools gold (pyrite) and aventurine. No person will leave empty handed. For more information on sluices click the sluice category below.